The pistol-caliber carbine occupies an awkward tactical niche. Not as compact as a pistol, not as powerful as a rifle, and lacking a submachine gun's automatic fire... what's to recommend it? How about virtually no recoil, man-killing accuracy out to 200 meters, the same ammo and magazines as your sidearm, and civilian-legal purchase around the world &ndash; all in a lightweight polymer package you can hide in a tennis racket bag? Interested now? Yeah, we thought so...